* 2 video channel of high-quality D1 resolution on real-time H.264 algorithm at full frame rate, with synchronized ADPCM audio

* Bi-directional audio

* Excellent video quality at low bit rate

* Alarm linkage with network failure, motion detection, video lost and external sensor input

* 3 types of independent real-time stream for local recording, remote terminals

* Self-test and built-in watchdog